Investments In Affordable Housing (Details) (USD $)	6 Months Ended	12 Months Ended
	Jun. 30, 2011	Dec. 31, 2010
Increase in total assets and liabilities from consolidating affordable housing equity interest	$ 23,200,000	$ 22,800,000
Investments in affordable housing partnerships	82,993,000	88,472,000
Number of limited partnerships in affordable housing investments with equity interest	6	6
Affordable Housing Limited Partnerships [Member]
Other borrowings from consolidating affordable housing equity interest	19,000,000	19,100,000
Other liabilities from affordable housing unfunded commitments	$ 1,800,000	$ 4,300,000